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Title: [3.11] gh-90949: add Expat API to prevent XML deadly allocations (CVE-2025-59375) (GH-139234) by hartwork · Pull Request #139529 · python/cpython · GitHub

Open Graph Title: [3.11] gh-90949: add Expat API to prevent XML deadly allocations (CVE-2025-59375) (GH-139234) by hartwork · Pull Request #139529 · python/cpython

X Title: [3.11] gh-90949: add Expat API to prevent XML deadly allocations (CVE-2025-59375) (GH-139234) by hartwork · Pull Request #139529 · python/cpython

Description: Expose the XML Expat 2.7.2 mitigation APIs to disallow use of disproportional amounts of dynamic memory from within an Expat parser (see CVE-2025-59375 for instance). The exposed APIs are available on Expat parsers, that is, parsers created by xml.parsers.expat.ParserCreate(), as: parser.SetAllocTrackerActivationThreshold(threshold), and parser.SetAllocTrackerMaximumAmplification(max_factor). (cherry picked from commit f04bea4) CC @picnixz Issue: gh-90949 📚 Documentation preview 📚: https://cpython-previews--139529.org.readthedocs.build/

Open Graph Description: Expose the XML Expat 2.7.2 mitigation APIs to disallow use of disproportional amounts of dynamic memory from within an Expat parser (see CVE-2025-59375 for instance). The exposed APIs are available...

X Description: Expose the XML Expat 2.7.2 mitigation APIs to disallow use of disproportional amounts of dynamic memory from within an Expat parser (see CVE-2025-59375 for instance). The exposed APIs are available...

Opengraph URL: https://github.com/python/cpython/pull/139529

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[3.11] gh-90949: add Expat API to prevent XML deadly allocations (CVE-2025-59375) (GH-139234) https://github.com/python/cpython/pull/139529/files#top
Show all changes 8 commits https://github.com/python/cpython/pull/139529/files
a295473 gh-90949: add Expat API to prevent XML deadly allocations (CVE-2025-5… picnixz Sep 26, 2025 https://github.com/python/cpython/pull/139529/commits/a295473f24ea0eacf17dae5485150f2f612ae264
5680561 gh-90949: amend GH-139234 in prevision of future mitigation API (#139… picnixz Sep 26, 2025 https://github.com/python/cpython/pull/139529/commits/5680561ce633d02b2ae0e486ef574780161ffcdc
1531331 Make use of macro _Py_ID possible to pyexpat hartwork Oct 2, 2025 https://github.com/python/cpython/pull/139529/commits/1531331ff2a2b1d6b8685bca52736f6f9114cbd8
d97e5e8 Add temporary workaround for issue 139400 hartwork Oct 2, 2025 https://github.com/python/cpython/pull/139529/commits/d97e5e85f3be8be021794cdfe0603cedd0204af4
38f9c63 Revert introduction of stddef.h import hartwork Oct 3, 2025 https://github.com/python/cpython/pull/139529/commits/38f9c631aa2faf9925579782f43b9055df6da836
cd7ce12 Merge remote-tracking branch 'upstream/3.11' into backport-f04bea4-3.11 hartwork Oct 7, 2025 https://github.com/python/cpython/pull/139529/commits/cd7ce12eed59f44b41a2979c83aa53d6b02af365
a6b0561 Drop workaround for 139400 as no-longer-needed hartwork Oct 7, 2025 https://github.com/python/cpython/pull/139529/commits/a6b05616d3d7b6144fe1434848e1da2e86ab4145
cdf58fd Merge remote-tracking branch 'upstream/3.11' into backport-f04bea4-3.11 hartwork Nov 2, 2025 https://github.com/python/cpython/pull/139529/commits/cdf58fdc4032bd225753d4192f0076af26235601
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